/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFrameworkEditor/Public/MLDeformerMorphModelEditorModel.h
Fill the mask buffer for a given item with a specific value. An item can be a bone, curve, bone group or curve group. The number of values written is always Model->GetNumBaseMeshVerts().
void FillMaskValues ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< float > ItemMaskBuffer, float Value ) const